octeon: fix invalid mac length in chacha poly

This patch fixes invalid mac length to resolve crash in Chacha Poly.

Type: fix
JIRA: https://essjira.marvell.com/browse/IPBUSW-62078

Signed-off-by: Nithinsen Kaithakadan <[email protected]>
Change-Id: Ia940a721b5cb47f7b5fe68adbea78adaaa0f54f0
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/toolkits/vpp/+/147957
Reviewed-by: Monendra Singh Kushwaha <[email protected]>
Tested-by: sa_ip-toolkits-Jenkins <[email protected]>
(cherry picked from commit 2a43de5e1260df3809aa25a0d02fefc95945b5c6)
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/toolkits/vpp/+/147963
Tested-by: Monendra Singh Kushwaha <[email protected]>

Author: nkaithakadan

src/plugins/dev_octeon/crypto.c

@@ -1362,7 +1362,7 @@ oct_crypto_aead_session_update (vlib_main_t *vm, oct_crypto_sess_t *sess,
   vnet_crypto_key_t *key = vnet_crypto_get_key (key_index);
   roc_se_cipher_type enc_type = 0;
   roc_se_auth_type auth_type = 0;
-  u32 digest_len = ~0;
+  u32 digest_len = 16;
   i32 rv = 0;
 
   switch (key->async_alg)
@@ -1374,9 +1374,6 @@ oct_crypto_aead_session_update (vlib_main_t *vm, oct_crypto_sess_t *sess,
       sess->aes_gcm = 1;
       sess->iv_offset = 0;
       sess->iv_length = 16;
-      sess->cpt_ctx.mac_len = 16;
-      sess->cpt_op = type;
-      digest_len = 16;
       break;
     case VNET_CRYPTO_ALG_CHACHA20_POLY1305:
       enc_type = ROC_SE_CHACHA20;
@@ -1389,6 +1386,9 @@ oct_crypto_aead_session_update (vlib_main_t *vm, oct_crypto_sess_t *sess,
       return -1;
     }
 
+  sess->cpt_ctx.mac_len = digest_len;
+  sess->cpt_op = type;
+
   rv = roc_se_ciph_key_set (&sess->cpt_ctx, enc_type, key->data,
 			    vec_len (key->data));
   if (rv)